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Insulation Aluminum Foil For Cable Shielding
Our lives are inseparable from electricity, and electricity is transmitted through cables, so what kind of cables are of good quality?
First observe the roundness of the insulating medium. The cross-section of the cable is very round. The outer shield of the cable and the aluminum foil of the cable are attached to the outer surface of the insulating medium. The smoother the outer surface of the medium is, the smaller the gap between the cable aluminum foil and its outer surface, and vice versa. Practice has proved that the smaller the gap, the better the quality. In addition, if the gap is too large, air is more likely to invade the shielding layer and affect the service life.
Check the braided mesh of the coaxial cable. The braided network wire of the coaxial cable plays an important role in the shielding performance of the coaxial cable, and it is still used as a loop line in the centralized power supply cable TV line. Therefore, its detection must be based on whether the braided network is tight and flat. The method is to use the coaxial cable. Strip the outer sheath of the cable, and subtract the next section to appraise the number of braided nets. If it matches the given index value, it is qualified, and if it is less than the given index value, it is unqualified.
Check the quality of the cable aluminum foil; the important shielding role of the coaxial cable is the cable aluminum foil, which plays an important role in preventing external open-circuit signal interference and cable TV signal leakage. Therefore, the quality of the cable aluminum foil should be checked for the new coaxial cable. First, peel off the sheath layer to observe whether the surface of the braided network cable and the aluminum foil layer of the cable has a good gloss; secondly, take a section of the cable, wind it on a small metal shaft, straighten it and turn it in the opposite direction, and repeat it several times. Check to see whether the cable aluminum foil is broken or not. You can also cut out a small piece of cable aluminum foil and repeatedly knead and stretch it in your hand. After repeated kneading and stretching, it still does not break. It is qualified if it has a certain degree of toughness, otherwise it is a defective product.
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